Canon EF 800mm f/5.6L IS USM EF800mm F5.6L IS USM Instruction Manual - Page 9

7. Focus Preset By presetting any focusing distance, you can instantly focus at that point even while you are shooting a different subject. This function operates in both the AF and MF modes. How to Set Set the focus preset switch to or . Press the shutter button halfway to focus the distance you want to preset. Press the focus preset button. • The focused distance will be preset. • If the focus preset switch was set to , the beeper will sound once. How to Focus at the Preset Distance While turning the playback ring to the left or right, press the shutter button completely. • The lens will focus at the preset distance. • If the focus preset switch was set to , the beeper will sound twice. • When turning the playback ring, keep your finger away from the shutter button. In One-Shot AF mode, the exposure will be locked when you press the shutter button halfway and focus is achieved. So if you press the shutter button halfway while turning the playback ring, the exposure may not be correct. • When not using the focus preset, set the switch to OFF. In the following cases, the focusing distance scale will move slightly. It will not affect the image. • When you press the focus preset button. • When you turn the playback ring. ENG-8